Inserted saw-tooth.



Patented Feb. ,4, i902.

E. H. STEEDMAN. INSERTED SAW TOOTH.

(Application filed Oct. 11, 1901.)

(No Model.)

m: "cams PETER; o0. PnumJmc, WASHINGTON. o c.

UNrrnn STATES PATENT OFFICE.

EDYVIN II. STEEDMAN, OF ST. LOUIS, MISSOURI.

INSERTED SAW-TOOTH.

SPECIFICATION forming part of Letters Patent No. 692,490, dated February4, 1902. Application filed October 11, 1901. Serial No. 78,316. (Nomodel.)

T0 aZZ whom it may concern:

Be it known that I, EDWIN H. STEEDMAN, a citizen of the United States,residing at St. Louis, Missouri, have invented a certain new and usefulImprovement in Inserted Saw- Teeth, of which the following is a full,clear, and exact description, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, forming part of this specification, inwhich- Figure l is a side view of a saw with my improved tooth insertedtherein. Fig. 2 is a similar view showing the position of the partswhile inserting the tooth. Fig. 3 is a view of a section of asaw withthe tooth detached. Fig. 4 is a detail view of the mouthpiece, and Fig.5 is a detail view of the bit-piece.

This invention relates to new and useful improvements in insertibleteeth for saws, and pertains more particularly to that class of sawswhich are provided with a grooved recess to receive the mouthpiece andbit of the tooth, which are rolled into posit-ion in the said recess andheld therein by appropriate locking devices.

One of the objects of the invention is to provide a tooth for a sawwhich may be inserted in a recess describing an arc of a circle in thesaw, leaving sufficient material in the body of the saw to receive thestrain and resistance required when in operation instead of placing thesame on the inserted tooth.

Another object of the invention is to provide a tooth for a saw whichwhen inserted in a recess in the saw will firmly secure the bit of thetooth in position and at the same time allow the said bit the desiredpitch or hook.

Another object of the invention is to provide a saw-tooth composed of amouthpiece and bit which may be cheaply constructed and which whenplaced in position in the recess in the saw will form a firm solid locktherein, preventing any liability of the parts working loose when thesaw is in operation, and which at the same time may be easily ex tractedor inserted in said recess.

With these objects in View the invention consists in the construction,arrangement,

and combination of the several parts, all as will hereinafter bedescribed, and afterward pointed out in the claim.

In the drawings, 1 represents the body of the saw, which is providedwith a recess 2, said recess being in the form of a segment of a circledescribed from acenter,with the same radius throughout, said recessterminating at its rear edge in a shoulder 3, against which shoulder thebit-piece abuts. The edges of this recess are beveled or inclined oneach side to provide an inverted-V-shaped edge for cooperating withcorrespondiugly-shaped grooves in the peripheries of the mouth and bitpieces.

4. indicates the mouthpiece, which is semicrescentric in shape, theouter periphery thereof being formed with a V-shaped groove to cooperatewith the edge of the recess'in the body of the saw, said periphery beingdescribed from a center corresponding to the center of said recess, saidmouthpiece, however, being of slightly greater diameter than the recess,sothat it is slightly sprung when in position. The heel of thismouthpiece is notched, as at 5, the said notch forming a shoulder orfulcrum-point 6. The extremity of the heel is formed with beveled facesto provide an interlocking projection 7. An opening 8 is also formed inthe mouthpiece for the reception of an appropriate tool,whereby themouthpiece may be forced into or out of position.

9 indicates the bit-piece, aportion of Whose periphery is [provided witha V-shaped groove struck from an arc of a circle having a radius commonto that of the recess 2. This bitpiece above said curved periphery isprovided with a shoulder 10, which is designed when the parts are in theposition shown in Fig. 1 to abut against the shoulder 3. this bit-pieceis provided with a projection 11, which matches with the recess 5 in theheel portion of the mouthpiece, said projection 11 forming a recess 12for receiving the fulcrum-point 6 of the mouthpiece.

13 indicates a shoulder formed with a groove which cooperates with theinterlocking projection 7 of the mouthpiece.

In operation the parts are assembled, as

The heel of shown in Fig. 2, preparatory to inserting the tooth in thesaw. The mouthpiece is turned around, drawing the bit-piece after ituntil the shoulder 10 abuts against the shoulder 3. In this operationthe bit-piece is caused to rock on the fulcrum-point 6, the heel of saidbit-piece being crowded or pinched when in position, so that whenvthetooth is home, as shown in Fig. 1, the upper portion of the bitpiece bythe engagement of the shoulder 10 with the shoulder 3 is rocked inward,forcing the recessed shoulder 13 down onto the interlocking shoulder 7of the mouthpiece. When the parts are in this position, both themouthpiece and the bit-piece are prevented from lateral displacement.The projection 11 being received in the recess 5 prevents independentrotation of either the mouth or bit piece. The grooved peripheries ofthe mouth and bit pieces prevent lateral displacement of said parts, andthe interlocking of the projection 7 with the shoulder 13 firmly holdsthe inneredge of the bit-piece against lateral displacement. The strainon the bit-piece is communicated directly through the shoulder 10 ontothe shoulder 3, so that the parts have no tendency to rotate in therecess. Of course the inner faces of the heels of both the mouth and bitpieces are constructed so as to permit a proper play of the bit-piece inrocking on its fulcrum in order to efiect a pinching or binding actionof the bit-piece referred to.

I am aware that many minor changes in construction, arrangement, andcombination of the several parts of my device can be made andsubstituted for those herein shown and 1 described without in the leastdeparting from the nature and principle of my invention.

Having thus described my invention, what I claim, and desire to secureby Letters Patent of the United States, is

The combination with a saw-plate having a curved recess whose peripheryis struck from a single center, and a bit-piece whose back conforms toand engages the said plate at the periphery of said recess, saidbit-piece having at its front a shoulder, a projection at the inner endof the bit-piece, and a recess formed by said projection and the bodyportion of the bit-piece between said shoulder and said projection, of aresilient mouthpiece whose outer periphery conforms to and engages thesaid plate at the periphery of said recess, said mouthpiece having anend portion which, when the parts are assembled in said recess, engagesunder said shoulder upon the bitpiece, a recess which receives saidprojection upon the bit-piece,and a fulcrum-point which engages saidrecess upon the bit-piece, there being, when the said parts areassembled in the said recess of the saw-plate, engagement between saidbit-piece and said mouthpiece only at the said shoulder and the point ofthe said fulcrum; substantially as described.

In testimony whereof I hereunto atlix my signature, in the presence oftwo Witnesses, this 7th day of October, 1901.

EDWIN H. STEEDMAN.

Witnesses:

GEORGE BAKEVVELL, G. A. PENNINGTON.

